[mojo] include mojo header in /components/services/unzip

This is preparation CL to use forward declaration only header in mojo's
generated code.
If we include forward declaration only header in mojo's generated code, we need
to include mojo header files in some places where definition is necessary.

master CL is in
https://chromium-review.googlesource.com/c/chromium/src/+/1438975

CC=rockot@google.com

This CL was uploaded by git cl split.

R=sorin@chromium.org

Bug: 922875
Change-Id: I2a0ff738af8f928e1d5d7f34342fc2576330df48
Reviewed-on: https://chromium-review.googlesource.com/c/1447142
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627704}

components/services/unzip/public/cpp/test_unzip_service.cc

@@ -4,6 +4,8 @@
 
 #include "components/services/unzip/public/cpp/test_unzip_service.h"
 
+#include "components/services/filesystem/public/interfaces/directory.mojom.h"
+
 namespace unzip {
 
 CrashyUnzipService::CrashyUnzipService(

components/services/unzip/unzipper_impl.cc

@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
+#include "components/services/filesystem/public/interfaces/directory.mojom.h"
 #include "third_party/zlib/google/zip.h"
 #include "third_party/zlib/google/zip_reader.h"